It give the this error, 'Email template welcome is not found'. I was thinking that template is the message to be sent in email. There is no help on API about this attribute , template. Can anybody explain it to me? I'll be thankful.

That error means you haven't created an email template on the ACS website yet. Log in to your Appcelerator App Console, click "Manage ACS" under the app you're working on, then click the "Email Templates" tab, and "Create an Email Template".

Now getting error about non-configured SMTP. Tried to do it but failed. Following are the configurations, I was using. I'm unable to configure SMTP settings for my app. I'm using following configurations. Username: ____________@gmail.com Password: gmail account password TLS: true SMTP Address: smtp.gmail.com Port: 465 When I click on save settings, a pop-up asks for email address. I'm using _________@gmail.com there. But settings are not configured. Please help me in this problem.
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AmmarSep 18 '12 at 6:33

Sorry, you're on your own with your SMTP settings. You might check to make sure SMTP is enabled for your gmail account. I just tested that ACS is able to send email through my gmail account, so it is something you are doing wrong.
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Dawson TothSep 18 '12 at 12:51